下面列出了怎么用java.security.spec.DSAParameterSpec的API类实例代码及写法，或者点击链接到github查看源代码。
/**
* Returns the DSA parameters associated with this key, or null if the
* parameters could not be parsed.
*/
public DSAParams getParams() {
try {
if (algid instanceof DSAParams) {
return (DSAParams)algid;
} else {
DSAParameterSpec paramSpec;
AlgorithmParameters algParams = algid.getParameters();
if (algParams == null) {
return null;
}
paramSpec = algParams.getParameterSpec(DSAParameterSpec.class);
return (DSAParams)paramSpec;
}
} catch (InvalidParameterSpecException e) {
return null;
}
}
/**
* Returns the DSA parameters associated with this key, or null if the
* parameters could not be parsed.
*/
public DSAParams getParams() {
try {
if (algid instanceof DSAParams) {
return (DSAParams)algid;
} else {
DSAParameterSpec paramSpec;
AlgorithmParameters algParams = algid.getParameters();
if (algParams == null) {
return null;
}
paramSpec = algParams.getParameterSpec(DSAParameterSpec.class);
return (DSAParams)paramSpec;
}
} catch (InvalidParameterSpecException e) {
return null;
}
}
/**
* Generates a pair of keys usable by any JavaSecurity compliant
* DSA implementation.
*/
public KeyPair generateKeyPair() {
if (random == null) {
random = JCAUtil.getSecureRandom();
}
DSAParameterSpec spec;
try {
if (forceNewParameters) {
// generate new parameters each time
spec = ParameterCache.getNewDSAParameterSpec(plen, qlen, random);
} else {
if (params == null) {
params =
ParameterCache.getDSAParameterSpec(plen, qlen, random);
}
spec = params;
}
} catch (GeneralSecurityException e) {
throw new ProviderException(e);
}
return generateKeyPair(spec.getP(), spec.getQ(), spec.getG(), random);
}
/**
* Returns the DSA parameters associated with this key, or null if the
* parameters could not be parsed.
*/
public DSAParams getParams() {
try {
if (algid instanceof DSAParams) {
return (DSAParams)algid;
} else {
DSAParameterSpec paramSpec;
AlgorithmParameters algParams = algid.getParameters();
if (algParams == null) {
return null;
}
paramSpec = algParams.getParameterSpec(DSAParameterSpec.class);
return (DSAParams)paramSpec;
}
} catch (InvalidParameterSpecException e) {
return null;
}
}
/**
* Returns the DSA parameters associated with this key, or null if the
* parameters could not be parsed.
*/
public DSAParams getParams() {
try {
if (algid instanceof DSAParams) {
return (DSAParams)algid;
} else {
DSAParameterSpec paramSpec;
AlgorithmParameters algParams = algid.getParameters();
if (algParams == null) {
return null;
}
paramSpec = algParams.getParameterSpec(DSAParameterSpec.class);
return (DSAParams)paramSpec;
}
} catch (InvalidParameterSpecException e) {
return null;
}
}
/**
* Returns the DSA parameters associated with this key, or null if the
* parameters could not be parsed.
*/
public DSAParams getParams() {
try {
if (algid instanceof DSAParams) {
return (DSAParams)algid;
} else {
DSAParameterSpec paramSpec;
AlgorithmParameters algParams = algid.getParameters();
if (algParams == null) {
return null;
}
paramSpec = algParams.getParameterSpec(DSAParameterSpec.class);
return (DSAParams)paramSpec;
}
} catch (InvalidParameterSpecException e) {
return null;
}
}
protected <T extends AlgorithmParameterSpec>
T engineGetParameterSpec(Class<T> paramSpec)
throws InvalidParameterSpecException
{
try {
Class<?> dsaParamSpec = Class.forName
("java.security.spec.DSAParameterSpec");
if (dsaParamSpec.isAssignableFrom(paramSpec)) {
return paramSpec.cast(
new DSAParameterSpec(this.p, this.q, this.g));
} else {
throw new InvalidParameterSpecException
("Inappropriate parameter Specification");
}
} catch (ClassNotFoundException e) {
throw new InvalidParameterSpecException
("Unsupported parameter specification: " + e.getMessage());
}
}
/**
* Initializes the DSA key pair generator. If <code>genParams</code>
* is false, a set of pre-computed parameters is used.
*/
@Override
public void initialize(int modlen, boolean genParams,
SecureRandom random) throws InvalidParameterException {
if (genParams) {
super.init(modlen, random, true);
} else {
DSAParameterSpec cachedParams =
ParameterCache.getCachedDSAParameterSpec(modlen,
getDefDSASubprimeSize(modlen));
if (cachedParams == null) {
throw new InvalidParameterException
("No precomputed parameters for requested modulus" +
" size available");
}
super.init(cachedParams, random, false);
}
}
private static void checkParamStrength(AlgorithmParameters param,
DSAGenParameterSpec genParam)
throws Exception {
String algo = param.getAlgorithm();
if (!algo.equalsIgnoreCase("DSA")) {
throw new RuntimeException("Unexpected type of parameters: " + algo);
}
DSAParameterSpec spec = param.getParameterSpec(DSAParameterSpec.class);
int valueL = spec.getP().bitLength();
int strength = genParam.getPrimePLength();
if (strength != valueL) {
System.out.println("P: Expected " + strength + " but actual " + valueL);
throw new RuntimeException("Wrong P strength");
}
int valueN = spec.getQ().bitLength();
strength = genParam.getSubprimeQLength();
if (strength != valueN) {
System.out.println("Q: Expected " + strength + " but actual " + valueN);
throw new RuntimeException("Wrong Q strength");
}
}
/**
* Returns the DSA parameters associated with this key, or null if the
* parameters could not be parsed.
*/
public DSAParams getParams() {
try {
if (algid instanceof DSAParams) {
return (DSAParams)algid;
} else {
DSAParameterSpec paramSpec;
AlgorithmParameters algParams = algid.getParameters();
if (algParams == null) {
return null;
}
paramSpec = algParams.getParameterSpec(DSAParameterSpec.class);
return (DSAParams)paramSpec;
}
} catch (InvalidParameterSpecException e) {
return null;
}
}
protected <T extends AlgorithmParameterSpec>
T engineGetParameterSpec(Class<T> paramSpec)
throws InvalidParameterSpecException
{
try {
Class<?> dsaParamSpec = Class.forName
("java.security.spec.DSAParameterSpec");
if (dsaParamSpec.isAssignableFrom(paramSpec)) {
return paramSpec.cast(
new DSAParameterSpec(this.p, this.q, this.g));
} else {
throw new InvalidParameterSpecException
("Inappropriate parameter Specification");
}
} catch (ClassNotFoundException e) {
throw new InvalidParameterSpecException
("Unsupported parameter specification: " + e.getMessage());
}
}
/**
* Returns the DSA parameters associated with this key, or null if the
* parameters could not be parsed.
*/
public DSAParams getParams() {
try {
if (algid instanceof DSAParams) {
return (DSAParams)algid;
} else {
DSAParameterSpec paramSpec;
AlgorithmParameters algParams = algid.getParameters();
if (algParams == null) {
return null;
}
paramSpec = algParams.getParameterSpec(DSAParameterSpec.class);
return (DSAParams)paramSpec;
}
} catch (InvalidParameterSpecException e) {
return null;
}
}
/**
* Returns the DSA parameters associated with this key, or null if the
* parameters could not be parsed.
*/
public DSAParams getParams() {
try {
if (algid instanceof DSAParams) {
return (DSAParams)algid;
} else {
DSAParameterSpec paramSpec;
AlgorithmParameters algParams = algid.getParameters();
if (algParams == null) {
return null;
}
paramSpec = algParams.getParameterSpec(DSAParameterSpec.class);
return (DSAParams)paramSpec;
}
} catch (InvalidParameterSpecException e) {
return null;
}
}
JDKDSAPublicKey(
SubjectPublicKeyInfo info)
{
ASN1Integer derY;
try
{
derY = (ASN1Integer)info.parsePublicKey();
}
catch (IOException e)
{
throw new IllegalArgumentException("invalid info structure in DSA public key");
}
this.y = derY.getValue();
if (isNotNull(info.getAlgorithm().getParameters()))
{
DSAParameter params = DSAParameter.getInstance(info.getAlgorithm().getParameters());
this.dsaSpec = new DSAParameterSpec(params.getP(), params.getQ(), params.getG());
}
}
/**
* Returns the DSA parameters associated with this key, or null if the
* parameters could not be parsed.
*/
public DSAParams getParams() {
try {
if (algid instanceof DSAParams) {
return (DSAParams)algid;
} else {
DSAParameterSpec paramSpec;
AlgorithmParameters algParams = algid.getParameters();
if (algParams == null) {
return null;
}
paramSpec = algParams.getParameterSpec(DSAParameterSpec.class);
return (DSAParams)paramSpec;
}
} catch (InvalidParameterSpecException e) {
return null;
}
}
public void initialize(
AlgorithmParameterSpec params,
SecureRandom random)
throws InvalidAlgorithmParameterException
{
if (!(params instanceof DSAParameterSpec))
{
throw new InvalidAlgorithmParameterException("parameter object not a DSAParameterSpec");
}
DSAParameterSpec dsaParams = (DSAParameterSpec)params;
param = new DSAKeyGenerationParameters(random, new DSAParameters(dsaParams.getP(), dsaParams.getQ(), dsaParams.getG()));
engine.init(param);
initialised = true;
}
/**
* Initializes the DSA key pair generator. If <code>genParams</code>
* is false, a set of pre-computed parameters is used.
*/
@Override
public void initialize(int modlen, boolean genParams,
SecureRandom random) throws InvalidParameterException {
if (genParams) {
super.init(modlen, random, true);
} else {
DSAParameterSpec cachedParams =
ParameterCache.getCachedDSAParameterSpec(modlen,
getDefDSASubprimeSize(modlen));
if (cachedParams == null) {
throw new InvalidParameterException
("No precomputed parameters for requested modulus" +
" size available");
}
super.init(cachedParams, random, false);
}
}
/**
* Returns the DSA parameters associated with this key, or null if the
* parameters could not be parsed.
*/
public DSAParams getParams() {
try {
if (algid instanceof DSAParams) {
return (DSAParams)algid;
} else {
DSAParameterSpec paramSpec;
AlgorithmParameters algParams = algid.getParameters();
if (algParams == null) {
return null;
}
paramSpec = algParams.getParameterSpec(DSAParameterSpec.class);
return (DSAParams)paramSpec;
}
} catch (InvalidParameterSpecException e) {
return null;
}
}
/**
* Returns the DSA parameters associated with this key, or null if the
* parameters could not be parsed.
*/
public DSAParams getParams() {
try {
if (algid instanceof DSAParams) {
return (DSAParams)algid;
} else {
DSAParameterSpec paramSpec;
AlgorithmParameters algParams = algid.getParameters();
if (algParams == null) {
return null;
}
paramSpec = algParams.getParameterSpec(DSAParameterSpec.class);
return (DSAParams)paramSpec;
}
} catch (InvalidParameterSpecException e) {
return null;
}
}
protected <T extends AlgorithmParameterSpec>
T engineGetParameterSpec(Class<T> paramSpec)
throws InvalidParameterSpecException
{
try {
Class<?> dsaParamSpec = Class.forName
("java.security.spec.DSAParameterSpec");
if (dsaParamSpec.isAssignableFrom(paramSpec)) {
return paramSpec.cast(
new DSAParameterSpec(this.p, this.q, this.g));
} else {
throw new InvalidParameterSpecException
("Inappropriate parameter Specification");
}
} catch (ClassNotFoundException e) {
throw new InvalidParameterSpecException
("Unsupported parameter specification: " + e.getMessage());
}
}
/**
* Returns the DSA parameters associated with this key, or null if the
* parameters could not be parsed.
*/
public DSAParams getParams() {
try {
if (algid instanceof DSAParams) {
return (DSAParams)algid;
} else {
DSAParameterSpec paramSpec;
AlgorithmParameters algParams = algid.getParameters();
if (algParams == null) {
return null;
}
paramSpec = algParams.getParameterSpec(DSAParameterSpec.class);
return (DSAParams)paramSpec;
}
} catch (InvalidParameterSpecException e) {
return null;
}
}
/**
* Initializes the DSA key pair generator. If <code>genParams</code>
* is false, a set of pre-computed parameters is used.
*/
@Override
public void initialize(int modlen, boolean genParams,
SecureRandom random) throws InvalidParameterException {
if (genParams) {
super.init(modlen, random, true);
} else {
DSAParameterSpec cachedParams =
ParameterCache.getCachedDSAParameterSpec(modlen,
getDefDSASubprimeSize(modlen));
if (cachedParams == null) {
throw new InvalidParameterException
("No precomputed parameters for requested modulus" +
" size available");
}
super.init(cachedParams, random, false);
}
}
/**
* Returns the DSA parameters associated with this key, or null if the
* parameters could not be parsed.
*/
public DSAParams getParams() {
try {
if (algid instanceof DSAParams) {
return (DSAParams)algid;
} else {
DSAParameterSpec paramSpec;
AlgorithmParameters algParams = algid.getParameters();
if (algParams == null) {
return null;
}
paramSpec = algParams.getParameterSpec(DSAParameterSpec.class);
return (DSAParams)paramSpec;
}
} catch (InvalidParameterSpecException e) {
return null;
}
}
/**
* Returns the DSA parameters associated with this key, or null if the
* parameters could not be parsed.
*/
public DSAParams getParams() {
try {
if (algid instanceof DSAParams) {
return (DSAParams)algid;
} else {
DSAParameterSpec paramSpec;
AlgorithmParameters algParams = algid.getParameters();
if (algParams == null) {
return null;
}
paramSpec = algParams.getParameterSpec(DSAParameterSpec.class);
return (DSAParams)paramSpec;
}
} catch (InvalidParameterSpecException e) {
return null;
}
}
protected <T extends AlgorithmParameterSpec>
T engineGetParameterSpec(Class<T> paramSpec)
throws InvalidParameterSpecException
{
try {
Class<?> dsaParamSpec = Class.forName
("java.security.spec.DSAParameterSpec");
if (dsaParamSpec.isAssignableFrom(paramSpec)) {
return paramSpec.cast(
new DSAParameterSpec(this.p, this.q, this.g));
} else {
throw new InvalidParameterSpecException
("Inappropriate parameter Specification");
}
} catch (ClassNotFoundException e) {
throw new InvalidParameterSpecException
("Unsupported parameter specification: " + e.getMessage());
}
}
protected <T extends AlgorithmParameterSpec>
T engineGetParameterSpec(Class<T> paramSpec)
throws InvalidParameterSpecException
{
try {
Class<?> dsaParamSpec = Class.forName
("java.security.spec.DSAParameterSpec");
if (dsaParamSpec.isAssignableFrom(paramSpec)) {
return paramSpec.cast(
new DSAParameterSpec(this.p, this.q, this.g));
} else {
throw new InvalidParameterSpecException
("Inappropriate parameter Specification");
}
} catch (ClassNotFoundException e) {
throw new InvalidParameterSpecException
("Unsupported parameter specification: " + e.getMessage());
}
}
/**
* Initializes the DSA key pair generator. If <code>genParams</code>
* is false, a set of pre-computed parameters is used.
*/
@Override
public void initialize(int modlen, boolean genParams,
SecureRandom random) throws InvalidParameterException {
if (genParams) {
super.init(modlen, random, true);
} else {
DSAParameterSpec cachedParams =
ParameterCache.getCachedDSAParameterSpec(modlen,
getDefDSASubprimeSize(modlen));
if (cachedParams == null) {
throw new InvalidParameterException
("No precomputed parameters for requested modulus" +
" size available");
}
super.init(cachedParams, random, false);
}
}
public void initialize(
AlgorithmParameterSpec params,
SecureRandom random)
throws InvalidAlgorithmParameterException
{
if (!(params instanceof DSAParameterSpec))
{
throw new InvalidAlgorithmParameterException("parameter object not a DSAParameterSpec");
}
DSAParameterSpec dsaParams = (DSAParameterSpec)params;
param = new DSAKeyGenerationParameters(random, new DSAParameters(dsaParams.getP(), dsaParams.getQ(), dsaParams.getG()));
engine.init(param);
initialised = true;
}
/**
* Returns the DSA parameters associated with this key, or null if the
* parameters could not be parsed.
*/
public DSAParams getParams() {
try {
if (algid instanceof DSAParams) {
return (DSAParams)algid;
} else {
DSAParameterSpec paramSpec;
AlgorithmParameters algParams = algid.getParameters();
if (algParams == null) {
return null;
}
paramSpec = algParams.getParameterSpec(DSAParameterSpec.class);
return (DSAParams)paramSpec;
}
} catch (InvalidParameterSpecException e) {
return null;
}
}
JDKDSAPublicKey(
SubjectPublicKeyInfo info)
{
ASN1Integer derY;
try
{
derY = (ASN1Integer)info.parsePublicKey();
}
catch (IOException e)
{
throw new IllegalArgumentException("invalid info structure in DSA public key");
}
this.y = derY.getValue();
if (isNotNull(info.getAlgorithm().getParameters()))
{
DSAParameter params = DSAParameter.getInstance(info.getAlgorithm().getParameters());
this.dsaSpec = new DSAParameterSpec(params.getP(), params.getQ(), params.getG());
}
}